GM has just announced another investment into one of its US plants. This time it's another move to expand full-size truck capacity, the second time it's announced doing that this year.

While last month it was an increase at the Fort Wayne, Indiana, pickup plant. This time it's $150 million for the Flint Truck Assembly plant in Flint, Michigan.

GM says that means it's put more than $1.6 billion into that plant since 2013, increasing capacity by 40,000 trucks a year and allowing more of the profitable crew cab and diesel options.

Along with the extra capacity, GM says the plant has added 1,000 new jobs this year, bringing the facility to more than 5,000 employees. The latest investment will enhance the conveyors at the plant as well as other tooling changes to increase capacity. The work is expected to be completed in the first half of next year.

"We have tremendous opportunities to grow our heavy-duty pickup business, because we've invested in capability, performance, innovation and capacity," said Mark Reuss, GM president. "Our all-new Chevrolet and GMC HD pickups are the toughest, strongest, most capable heavy-duty pickups we've ever brought to market, and our Flint team is up to the challenge to build world-class quality products to drive the growth."

The Flint plant first opened in 1947. It was the first home of the Corvette, building the first 300 of those cars in 1953. Flint was home of the Chevrolet Blazer during the 1970s, switching fully to pickup truck production in 1996. The plant currently runs three shifts building Silverado and Sierra.